Metal mold and process of making the same



I. D. McNElLL.

METAL MOLD AND PROCESS OF MAKING THE SAME.

APPLiCATlON FILED JAN.2I, 1919.

1,333,502 Patented Mar. 9, 1920.

2 SHETS-SHEET 1.

mvm wmmww W F'IT/ WITNESSES lNl/EN r00 ,4 TTORALEYS J. D. McNElLL.

METAL MOLD AND PROCESS OF MAKING THE SAME. APPucAHoN FILED 1AN.21. 1919.

1,333,502. Patented Mar. 9, 1920.

' ZSHEETS-SHEETZ- WITNESSES I j filmy; Y J z' A TTORNE Y8 jJoHN DENNISON McNEILL, orjorrroneo, ILLIN IS.

1 ME A MOLD AND PROCESS or MAKING THE SAME.

To all whom may concern: 1

Be it known that I, JoHrrD. MCNEILL,

a citizen of the United States, residing at- Chicago, county of Cook, and State; of Illinois, have invented certain new and useful Improvements in Metal Molds and-Processes of Makin the Same, of which the fol-' V v I lowing 1s a specification,

My invention relates to improvementeih;

metal molds and process of making the same, and it consists inythe combinations.

constructions and; arrangements herein deafter described." I I An objectof my inventlon is to provlde ametal mold from which a large number of scribed and claimed, and the stepshereincastings can be made, thereby obviating the necessity of making a separate mold for each casting, gas is done'in the case of sand molds. s

A further object of, myinvention is to provide a metalmold whereby the workiofi casting'certain' .articlesfm ay be materially lessened and'expedited, thereby tending to greater economy. I 1 Y A further object of my invention is to provide'a. process for making the metal mold in a novelmanner. e

Other objects and advantages will appear in the following. specification, and the; novel features of the invention will be particularly pointed out in the? appended-claims.

. My-invention is illustratedin; the accom plication, in which- I Figure 1 is a longitudinal sectional view through a drag used in the process;

Fig. 2 is a perspective view of a metal half pattern;

panying drawings, forming part ofthis' ap'- .Fig. 3 is a longitudinal sectional view of a half flask with a metal halfi pattern therein;

Fig. 4 is perspective viewof a half pattern with the projecting gate removed; Fig. 5 is a sectionalview through a half flask showing the manner in which'the metal cope is formed; and

Fig. 6 's a sectional view pleted metal mold.

In carrying out the process, I first place a drag (lower half flask) on a molding through the comboard with a half pattern such as a wood.

pattern, in position. Parting sand is then sifted over the pattern, this being followed by the addition of facing sand, and then molding sand, all; of which is rammed in and Specification of Letters Patent. 7 Patn and the of metal to the mold. The operation thus far described is ordinary, it being under the moldbeing shownat D. E is now placed overthe top of the flask :the underside and intothe mold. A pouringvhole G, and vent escaping throughthe vents Application fiIedJanuaryZI, 1919. Serial No. 272,306.

' aroundthe pattern fining the. flask. The

top is leveled off, a molding. board is placed on top, and the flask turned, or rolled over. The bottom board is'now removed and the cope (upper half flask) is placed on the drag, being held in position by flask pins at the sides. The upper .half of the pattern is now placed in position,

ing andmolding sand is sieved over it, and it is rammed, leveled,

the drag. The half'patterns are then drawn gates are cut to permit the passage stoodthat this mold just referred to is the sand mold for themaking ofa metal pat-- tern,-a nd not the iron mold which is the, subject ofthis invention. The sand'mold inthe drag is shown in Fig. 1. In this figure the drag is shown at A, resting onthe molde C in position,-

ing board Blwith the clamps A metal plate A with sand or metal cores F attached to projecting downwardly holes H, have previously been bored in the plate E. The underside of the plate E may be coatedwlth a graphite preparation before molten metal with the plate when poured. 7 1 p The clamps G being in positionand tightened to. securely fasten the plate E to the -drag, metal'is nowpoured into the mold ted. Mar. 9, 1920.

being alined with the halfpattern just molded. Parting, facp and afterward the. flask s broken, the cope being lifted from being placed inposition to prevent 'amalgas 'mation of the v through the hole G, the generated gases I-I.. After being poured, the metal is allowed to harden, and then the plate E is removed and the casting is removed from the sand. I ,now have a half metal pattern, such as that shown in I ig,-2 at K.

The-other portion of'the metal half pattern is made.- in asimilar manner in the .cope. The projecting gate corresponding to the gate is in Fig. '2, is removed and a half pattern ofmetal is obtained, like that shown at K in Fig. 4. I now tap and thread holes J in the metal half patterns K and K and with the use of screws S, I securely fasten the metal pattern K- to the plateE. The plate E with the half pattern K is now placed in ahalf flask in which a layer of sand T has been placed in the bottom and while still red-hot in order to providerfor inFig. '6.

I vided.

the layer- T, ing the lower surface of the pattern K pattern K attached is lifted off, and the metal M forming the mold is sand blasted a permanent facing protection. A metal drag has now been obtamed as shown at M The metal and vent holes as described in connection with the half pattern K. An empty half flask A is placed on a mold board B andprotecting sand layers T and T are pro- Sand or metal cores 0 having anchoring pins P are placedin position on the tops of'these cores engag- Sprue hole core Q is secured in position by means of pins P at the top and bottom, in the manner shown in Fig. 5, the bottom of I the core resting on the layerT and the top ofthe core engaging the plate The clamps C are placed in positionand tightened. Molten metal is then poured through the hole G around the pattern K and the cores O and Q, the gases escaping-through the vent holes H. The plateE is then re moved and the surface of the mold is sand blasted when red hot, as previously del scribed. The cores Oiand Q are broken and V taken out.

' I now insert sand cores l/V and ahollow f pouring core X inthe metal cope It thus formed. The parts of the'mold-are now coated with graphite andmay be placed together thus forming the complete mold U,

as shown in Fig. 6. r 7 y In casting, metal is poured through the pouring hole X. passing through the gate' 00 into the interior of the mold. As the metal is poured, I prefer to exhaust the airfrom themold by creating a partial vacuum in. the mold through the vent holes .W, thusv facilitating and hastening the escape vof gases from the mold, accelerating the flow of metal into the mold, and thus preventing the accumulation of the gas'm pockets which, as is well known, greatly weakens metal casting. I

halfpattern K is secured to a plateE' which is provided with pouring .7

. is formed.

JOHN DENNIsoN ne m t After pouring, the metal cope is lifted from the metal drag. and the casting removed. The cope may be again placed in position and metal againpoured in the mold proceeding in like manner until any number of castings, exactly similar to the master pattern, are obtained. if

It will be noted th t the provision. of the hollow sand cores for the pouring hole, and the vents permitsthe breaking'of theiron mold, 6.0., the separation of the parts of the mold; The cores may be readily replaced when necessary. 7

I clalm: V 1; A metal mold .OOlTlPl'lSlIlg-itlOWBl portion, an upper separable portion having apourlng opening, and vents," and franglble hollow cores for said J pourlng. opening and said vents.

tion having a pourlng' opening communie catlng with said gate and bemg provided with vents, and frangible hollow sand'cores vents. v V V 3. The herein described process'of making a metal mold which consists in suspending a half pattern in a half flask, andpouring metal into the space around said half 75,: 2. A metal mold comprising a lower portionhavinga gate, an upper separable pordisposed in said pouring opening and said pattern whereby half the mold is formed, suspending a second half pattern in ahalf flask, placing cores between said'half 'pat- I tern and the bottom of the flask, and a core extendingfrom the bottom to the top. of the 'flask, and pouring in:-metal around said second half pattern and sald cores where by the other half of the mold is formed.

i 4. The herein describedprocess of making.

a metal mold'which consists in suspending a halfpatternin.ahalf flask-having a refractory lining, and pouring in metal around said; half pattern whereby half the mold "is "formed, suspending a second half pattern in a half flask, placing cores between said half pattern and the bottom. of the flask,

and a core. extending fr'omthe bottom to the top of the flask, and pouring, in metal aroundsaid second halfpattern and said cores wherebythe other halfrof the mold Witnesses: V j IRENELG. MURPH Gno'. R- MoNmnn; 

